Okay, the comment above about the 'M' rating is retarded. However, 'M' as being 17 and above or 18 and above is ridiculous. PG-13 (THIRTEEN) movies have content that 'M' games do, so is it really surprising that 13 year olds are playing M rated games. I don't think it NECESSARILY (emphasis) has anything to do with bad parenting, though I'm sure there are instances, however, especially in a game like World at War, it's World War 2. There's nothing seriously bad about that game, or really in most mature games anymore.
My first M rated game was Diablo, back when I was 12. Yeah, I'm pretty sure I was able to handle it.
Though, to be honest, what were those kids even thinking? How in the world could you want to be in a clan that bad? I'm sure there are plenty of open clans too.